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United States · Election results history · 1986 Senate · Iowa
Election 1986 Results

Each election opens in its own mode: the forecast before the votes are counted, the live count while races are still too close to call, and the results once every race is decided.

1986 US Senate election in Iowa

Charles E. Grassley (Republican) beat John O. Roehrick (Democrat) in Iowa in 1986, 66.0% to 33.6%, a margin of 32.5 points and 289,474 votes.

The Republican hold continued from 1980, when Charles E. Grassley also won.

Republicans led in 98 of the 99 counties as they stood then and Democrats in 1. The largest, Polk, cast 99,056 votes and went to the Republican by 20.0 points. The closest was Wapello, where 37 votes separated the two parties.

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Early projection, based on early and incomplete polling: the likely matchups, each weighted by the betting markets' odds of both nominations, not a result. Each county is its 2024 presidential margin moved by its state's projected swing; set a national vote and every state, district and county moves by the same amount from our projection. Colours run in 100 steps from a safe Republican to a safe Democratic margin. Boundaries: US Census Bureau.

Senate

CandidatePartyVotesShare
Charles E. Grassley won Republican 588,880 66.0%
John O. Roehrick Democratic 299,406 33.6%
All other candidates 3,476 0.4%
Total891,762

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 39,305 39.7% 59,165 59.7% 586 99,056 R+20.0
Linn 17,413 34.0% 33,559 65.5% 279 51,251 R+31.5
Black Hawk 16,004 37.1% 27,005 62.6% 109 43,118 R+25.5
Scott 13,054 30.8% 29,125 68.8% 156 42,335 R+38.0
Woodbury 9,947 32.9% 20,226 66.8% 93 30,266 R+34.0
Johnson 10,353 39.3% 15,815 60.1% 164 26,332 R+20.7
Dubuque 10,755 40.9% 15,457 58.8% 61 26,273 R+17.9
Story 7,740 33.6% 15,221 66.1% 63 23,024 R+32.5
Pottawattamie 6,262 32.3% 13,045 67.2% 92 19,399 R+35.0
Cerro Gordo 5,341 30.9% 11,905 68.8% 59 17,305 R+37.9
Clinton 5,195 31.6% 11,181 68.0% 70 16,446 R+36.4
Marshall 5,918 41.7% 8,250 58.1% 22 14,190 R+16.4
Lee 6,414 47.7% 6,938 51.6% 96 13,448 R+3.9
Des Moines 5,560 43.4% 7,161 55.9% 90 12,811 R+12.5
Webster 4,859 38.5% 7,739 61.3% 24 12,622 R+22.8
Jasper 4,532 36.6% 7,762 62.7% 77 12,371 R+26.1
Warren 4,550 39.5% 6,944 60.3% 27 11,521 R+20.8
Wapello 5,630 49.9% 5,593 49.6% 51 11,274 D+0.3
Sioux 1,521 15.1% 8,546 84.8% 13 10,080 R+69.7
Dallas 3,953 40.9% 5,665 58.6% 49 9,667 R+17.7
Marion 3,382 37.1% 5,720 62.7% 14 9,116 R+25.6
Boone 3,261 37.4% 5,438 62.4% 21 8,720 R+25.0
Muscatine 2,157 26.7% 5,890 72.8% 40 8,087 R+46.2
Bremer 2,111 26.3% 5,905 73.5% 16 8,032 R+47.2
Fayette 2,390 30.1% 5,533 69.6% 24 7,947 R+39.5
Hardin 2,371 31.0% 5,270 68.8% 16 7,657 R+37.9
Plymouth 2,168 28.7% 5,366 71.0% 21 7,555 R+42.3
Benton 2,428 32.8% 4,944 66.9% 20 7,392 R+34.0
Buchanan 2,167 30.9% 4,821 68.7% 31 7,019 R+37.8
Mahaska 1,680 24.2% 5,255 75.6% 14 6,949 R+51.4
Buena Vista 1,958 28.3% 4,949 71.5% 12 6,919 R+43.2
Kossuth 2,214 32.5% 4,593 67.3% 14 6,821 R+34.9
Carroll 2,368 34.9% 4,399 64.9% 14 6,781 R+30.0
Poweshiek 2,135 32.6% 4,384 67.0% 22 6,541 R+34.4
Tama 2,273 34.9% 4,228 64.9% 10 6,511 R+30.0
Clayton 1,742 26.8% 4,749 73.0% 18 6,509 R+46.2
Jackson 1,831 29.3% 4,404 70.5% 15 6,250 R+41.2
Jones 1,790 29.3% 4,303 70.4% 22 6,115 R+41.1
Floyd 1,987 33.0% 4,014 66.7% 21 6,022 R+33.7
Winneshiek 1,514 25.4% 4,410 74.1% 27 5,951 R+48.7
Clay 1,943 32.8% 3,957 66.9% 19 5,919 R+34.0
Cherokee 1,992 33.7% 3,888 65.8% 31 5,911 R+32.1
Henry 1,685 29.1% 4,096 70.7% 16 5,797 R+41.6
Dickinson 1,770 30.9% 3,939 68.7% 22 5,731 R+37.8
Hamilton 1,722 30.6% 3,887 69.0% 22 5,631 R+38.4
O'Brien 1,492 26.5% 4,120 73.2% 14 5,626 R+46.7
Crawford 1,679 31.4% 3,652 68.3% 16 5,347 R+36.9
Chickasaw 1,671 31.6% 3,568 67.6% 42 5,281 R+35.9
Washington 1,422 27.2% 3,780 72.2% 32 5,234 R+45.1
Cass 1,302 25.3% 3,837 74.5% 14 5,153 R+49.2
Page 933 18.2% 4,161 81.2% 30 5,124 R+63.0
Butler 1,167 23.0% 3,900 76.9% 6 5,073 R+53.9
Allamakee 1,367 27.1% 3,666 72.6% 15 5,048 R+45.5
Iowa 1,208 24.1% 3,789 75.7% 7 5,004 R+51.6
Cedar 1,329 26.8% 3,598 72.6% 28 4,955 R+45.8
Delaware 1,314 26.6% 3,609 73.1% 15 4,938 R+46.5
Winnebago 1,271 25.9% 3,626 73.9% 7 4,904 R+48.0
Harrison 1,448 29.7% 3,424 70.1% 9 4,881 R+40.5
Union 1,602 33.6% 3,145 65.9% 24 4,771 R+32.3
Madison 1,795 38.1% 2,909 61.7% 10 4,714 R+23.6
Wright 1,444 31.3% 3,160 68.5% 8 4,612 R+37.2
Hancock 1,169 25.8% 3,361 74.0% 9 4,539 R+48.3
Appanoose 1,561 34.6% 2,926 64.9% 21 4,508 R+30.3
Grundy 986 22.0% 3,482 77.8% 6 4,474 R+55.8
Mitchell 1,246 28.3% 3,135 71.3% 15 4,396 R+43.0
Greene 1,391 31.9% 2,939 67.4% 28 4,358 R+35.5
Calhoun 1,241 28.6% 3,096 71.3% 8 4,345 R+42.7
Shelby 1,107 25.7% 3,181 73.8% 22 4,310 R+48.1
Howard 1,179 27.8% 3,047 71.7% 21 4,247 R+44.0
Humboldt 1,056 25.0% 3,154 74.6% 18 4,228 R+49.6
Jefferson 1,247 29.6% 2,964 70.3% 8 4,219 R+40.7
Franklin 1,001 24.0% 3,174 76.0% 4 4,179 R+52.0
Palo Alto 1,594 38.6% 2,525 61.1% 13 4,132 R+22.5
Sac 1,076 26.2% 3,023 73.5% 15 4,114 R+47.3
Keokuk 1,312 33.5% 2,584 66.0% 17 3,913 R+32.5
Guthrie 1,374 35.4% 2,486 64.0% 25 3,885 R+28.6
Pocahontas 1,053 27.7% 2,734 72.0% 11 3,798 R+44.3
Montgomery 819 21.7% 2,933 77.9% 15 3,767 R+56.1
Monona 1,136 30.3% 2,571 68.6% 39 3,746 R+38.3
Lyon 758 20.4% 2,946 79.3% 11 3,715 R+58.9
Emmet 1,241 33.9% 2,412 65.8% 12 3,665 R+32.0
Adair 1,064 30.0% 2,484 69.9% 4 3,552 R+40.0
Lucas 1,167 33.1% 2,353 66.7% 10 3,530 R+33.6
Worth 965 27.9% 2,472 71.5% 19 3,456 R+43.6
Mills 780 23.2% 2,565 76.4% 13 3,358 R+53.2
Clarke 1,044 31.4% 2,254 67.9% 22 3,320 R+36.4
Louisa 836 26.2% 2,345 73.6% 6 3,187 R+47.3
Ida 875 27.5% 2,298 72.3% 5 3,178 R+44.8
Decatur 939 29.6% 2,198 69.3% 35 3,172 R+39.7
Wayne 925 29.8% 2,164 69.8% 11 3,100 R+40.0
Monroe 1,168 39.4% 1,785 60.3% 8 2,961 R+20.8
Van Buren 915 31.0% 2,016 68.3% 19 2,950 R+37.3
Fremont 780 26.6% 2,135 72.9% 13 2,928 R+46.3
Davis 1,142 39.9% 1,711 59.8% 6 2,859 R+19.9
Audubon 899 32.1% 1,893 67.7% 6 2,798 R+35.5
Osceola 661 25.8% 1,899 74.1% 3 2,563 R+48.3
Taylor 675 26.6% 1,857 73.1% 8 2,540 R+46.5
Ringgold 694 31.0% 1,542 68.9% 3 2,239 R+37.9
Adams 541 24.6% 1,648 75.0% 7 2,196 R+50.4

Counties as they stood in 1986; some have since been split, merged or renamed. Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

Iowa Senate elections we hold

YearWinnerMargin
2022 Chuck Grassley (R) R+12.2
2020 Joni Ernst (R) R+6.6
2016 Chuck Grassley (R) R+24.4
2014 Joni Ernst (R) R+8.3
2010 Chuck Grassley (R) R+31.0
2008 Tom Harkin (D) D+25.4
2004 Charles E. Grassley (R) R+42.3
2002 Tom Harkin (D) D+10.4
1998 Charles E. Grassley (R) R+37.9
1996 Tom Harkin (D) D+5.1
1992 Chuck Grassley (R) R+42.4
1990 Tom Harkin (D) D+9.1
1986 Charles E. Grassley (R) R+32.5
1984 Tom Harkin (D) D+11.8
1980 Charles E. Grassley (R) R+7.9
1978 Roger W. Jepsen (R) R+3.2
1974 John C. Culver (D) D+4.8
1972 Dick Clark (D) D+11.0
1968 Harold E. Hughes (D) D+0.6
1966 Jack Miller (R) R+23.1
1962 Bourke Hickenlooper (R) R+6.8
1960 Jack Miller (R) R+3.8
1956 Bourke Hickenlooper (R) R+7.8
1954 Thomas E. Martin (R) R+4.7
1950 Bourke Hickenlooper (R) R+10.1
1948 Guy M. Gillette (D) D+16.2
1944 Bourke Hickenlooper (R) R+2.9
1942 George A. Wilson (R) R+16.3
1938 Guy M. Gillette (D) D+0.3
1936 Clyde L. Herring (D) D+3.4
1932 Richard L. Murphy (D) D+13.9
1930 Lester Dickinson (R) R+13.3
1926 Smith W. Brookhart (R) R+13.2
1924 Smith W. Brookhart (R) R+0.1
1920 Albert B. Cummins (R) R+24.0
1918 William S. Kenyon (R) R+30.8
1914 Albert B. Cummins (R) R+9.0